Enrico Pallazzo said:
Both Iran and Iraq caused major disruptions to it in the 1980s. This isn't some made up fantasy. They've known they can do it because it's not hard, unless we decide to send in an occupying force.
All I can tell you is that from our side, we had an operational assumption that we could likely reopen the straits if Iran tried to close them. That assumption has been shattered, not because Iran has some capability we didn't know about, but rather because shipping companies have just opted out of risking a passage through the straits even with the power of the US Navy trying to protect shipping.
I and others with military backgrounds on this topic will all tell you similar things.
I just don't think you are comprehending how massive of a shift it is to go from claiming to have the ability to close the straits to now having proof that they can close them just by saying the straits are closed. They don't even have to mine the straits or blockade them, they just say they are closed and the threat of a suicide drone is enough.
As for the history issue, I'm still not sure how you are trying to argue that disruptions to shipping during the Iran-Iraq war support your position. As soon as those two warring nations targeted shipping, the US Navy went in and sunk the entire Iranian fleet. Your example actually proves the opposite of what you claim, operation praying mantis was seen as an effective deterrent to Iranian threats of disrupting shipping and closing the straits for years. It's now apparent that Iranian irregular tactics are sufficient to present a threat to shipping.
And to make sure we're on topic here, this is where Trump's deal making is weak in this case because the Iranians really do have the stronger bargaining position and we are negotiating against a self imposed clock.
They proved they can survive our "Epic Fury" and they proved that traffic through Hormuz flows on their command. Our only way to strengthen our bargaining position would have been another round of bombing targeting major infrastructure to make life in Iran unbearable and thus crank the pressure up on the new leadership and for whatever reason Trump has remained remarkably restrained in not ordering new strikes.